vbatts/llama.cpp
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- Split multiplication and addition to make it easier for the compiler to optimise

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- Accumulate two acc instead of one

llama_print_timings:        load time =  3137.95 ms
llama_print_timings:      sample time =   132.54 ms /   128 runs   (    1.04 ms per token)
llama_print_timings: prompt eval time =  2943.22 ms /     8 tokens (  367.90 ms per token)
llama_print_timings:        eval time = 59539.50 ms /   127 runs   (  468.81 ms per token)
llama_print_timings:       total time = 62843.23 ms
This commit is contained in:
3ooabkhxtn 2023-05-12 08:04:54 +00:00
parent 524d6c9447
commit 607b9c7373
1 changed files with 19 additions and 5 deletions
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24
ggml.c
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@ -492,6 +492,15 @@ static inline float hsum_float_4(const __m128 x) {
return _mm_cvtss_f32(res);
}
// horizontally add 2x4 floats
static inline float hsum_float_2x4(const __m128 x, const __m128 y) {
__m128 res =_mm_hadd_ps(x, y);
res =_mm_hadd_ps(res, res);
res =_mm_hadd_ps(res, res);
return _mm_cvtss_f32(res);
}
#endif
#if __AVX__ || __AVX2__ || __AVX512F__
@ -2141,7 +2150,8 @@ static void ggml_vec_dot_q4_0_q8_0(const int n, float * restrict s, const void *
*s = hsum_float_8(acc);
#elif defined(__SSE3__)
// Initialize accumulator with zeros
__m128 acc = _mm_setzero_ps();
__m128 acc_0 = _mm_setzero_ps();
__m128 acc_1 = _mm_setzero_ps();
// Main loop
for (int i = 0; i < nb; ++i) {
@ -2167,12 +2177,16 @@ static void ggml_vec_dot_q4_0_q8_0(const int n, float * restrict s, const void *
__m128 p0 = _mm_cvtepi32_ps(i32_0);
__m128 p1 = _mm_cvtepi32_ps(i32_1);
// Apply the scale, and accumulate
acc = _mm_add_ps(_mm_mul_ps( d, p0 ), acc);
acc = _mm_add_ps(_mm_mul_ps( d, p1 ), acc);
// Apply the scale
__m128 p0_d = _mm_mul_ps( d, p0 );
__m128 p1_d = _mm_mul_ps( d, p1 );
// Accumulate
acc_0 = _mm_add_ps(p0_d, acc_0);
acc_1 = _mm_add_ps(p1_d, acc_1);
}
*s = hsum_float_4(acc);
*s = hsum_float_2x4(acc_0, acc_1);
#else
// scalar
float sumf = 0.0;